Most Yonex racquets of that era came in different weights - SL/UL and even changed depending on the grip size. I know for a fact that the difference between an L4 and SL2 RD-7 can be as much as 25g....

Heh actually no it's a Candycane! I switched briefly to the 1998 version for it's lighter swingweight - I must have set my avatar during that period. I soon began to miss the plowthrough and power of...